Six-Element Camera Lens with Glass and Plastic Materials
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for better imaging quality require more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of different materials (plastic and glass) with specific refractive powers and curvature radii, optimized to achieve ultra-thin and wide-angle capabilities while correcting aberrations, with conditions such as -3≤f1/f≤-1.5 for the first lens and 1.7≤n4≤2.2 for the fourth lens, ensuring balanced refractive powers and minimal optical length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into six distinct lens elements with different materials and optical properties. Each lens element (first through sixth lenses) serves specific functions for correcting different types of aberrations, allowing comprehensive optimization of imaging quality while maintaining manageable structural complexity through systematic segmentation of optical functions
Solution Approach 2:
The patent employs composite material construction with at least one glass lens element (fourth lens) combined with plastic lens elements. This composite approach leverages the superior optical properties of glass for chromatic aberration correction while using plastic for lightweighting and cost-effectiveness, achieving high imaging quality without excessive complexity
2Length of moving object
If the lens is made ultra-thin with total optical length less than 6.63 mm, then the device size is reduced, but the optical performance and aberration correction may deteriorate
Solution Approach 1:
The patent employs dynamic optimization of optical parameters including variable curvature radii, refractive indices, and thickness ratios across different lens elements. By dynamically adjusting these parameters within specific ranges (e.g., -3≤f1/f≤-1.5, 1.7≤n4≤2.2), the system achieves ultra-thin dimensions while maintaining excellent optical performance and aberration correction
Solution Approach 2:
The patent systematically changes critical optical parameters including the focal length ratios, refractive indices, and curvature radii of six lens elements. These parameter changes enable the lens to achieve ultra-thin total optical length while correcting chromatic and spherical aberrations, as evidenced by the specific parameter ranges provided for each lens element
3Illumination intensity
If the aperture F number is reduced to less than 2.16, then the light gathering ability is improved, but the lens complexity and manufacturing difficulty increase
Solution Approach 1:
Each lens element in the six-piece system performs multiple functions: the first and second lenses contribute to overall focusing while the third through sixth lenses correct various aberrations. This multi-functionality allows the system to achieve low F number (high light gathering ability) without proportionally increasing complexity, as each element serves several optical purposes simultaneously
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves excellent optical characteristics, including full correction of on-axis and off-axis chromatic aberrations, maintaining miniaturization and enhancing imaging quality with a total optical length of less than 6.63 mm and an aperture F number of less than 2.16, supporting wide-angle and ultra-thin lens development.
Implementation Method 1
A six-piece camera optical lens design is proposed, comprising lenses made of different materials (plastic and glass) with specific refractive powers and curvature radii
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.